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Shower mixer installation |
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| message from jack on 22 May 2004 |
Hi
Recently bought a Trevi Therm shower mixer. For the inlets into it for
hot and cold water and the mixed water out, there are 22mm compression
fittings. As my hot and cold pipes into it are 15mm would it make any
difference if I used 22mm to 15mm reducers in the fittings. I am just
wondering if there is a reason why they have used the larger fittings.
There is also a Trevi Xcite fixed shower head which has a 1/2 BSP male
fitting.
Jack
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| BigWallop replied to jack on 22 May 2004 |
Not totally up to speed on the design of the Trevi Shower system, but reducers
on the shower shouldn't make much difference as long as the pressure of water is
OK for the height of the shower head. If the pressure is not enough to create a
good flow from the shower head then you may need to install a pump on the outlet
side of the mixer valve to help draw water through the system. or you may need
a twin impellor pump on the supply pipes to help push the water up to the height
of the shower head to create a good flow rate for a decent shower.
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| jack replied to BigWallop on 22 May 2004 |
There is plenty of pressure in the feed pipes. The hot is fed from a
floor standing Worcester-Bosch combi boiler which is installed
upstairs, as will be the shower. The cold is direct from the rising
main. With the pressure we have there should be a good power shower. I
was just curious as to why there were 22mm compression fittings
supplied
Jack
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| BigWallop replied to jack on 22 May 2004 |
The 22 mm is there for the pressure reason. The bigger the pipe inlet, the more
flow rate through the pipework. but if you're drawing water from the mains then
you shouldn't have any problems.
One small word of caution though. Remember to balance the flow on both
supplies. This is easily done by turning the hot supply fully on and setting
the mixer valve at the mid point on the dial. Feel the water temperature. It
should be really hot if it is coming direct from the boiler. Leave the valve
set to the middle position and the hot supply fully on, then slowly turn the
cold on until the temperature of the water reaches a comfortable level for a
decent shower.
Balancing gives you a better range of control through the mixer, and because the
hot side is running through the boilers heat exchanger it loses some of its
momentum before reaching the shower. The cold supply coming directly from the
mains pipe is less restricted so doesn't need to be on as hard as the hot.
Good luck with it.
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Archived message: Shower mixer installation (UK DIY Home Improvement)
